Java - Application blocked by Security Settings

Your security settings have blocked an application

Trying to run a Java web application and getting a warring message:

Application Blocked
Application blocked by Security Settings.
Your security settings have blocked an application from running with an insecure or expired jre.

This simply means that you have out of date Java version and are trying to run unsigned or self-signed Java application.

Simply update Java to the latest version and the application should run.

If for some reason you can't update and absolutely need to run the application you can temporary reduce Java security level. This is obviously not recommended, only do this if you fully trust the Java application and have no ability to update.

  • Open Control Panel > Java
  • Switch to Security tab
  • Reduce Security Level from High to Medium
  • Click OK to save changes
    Java Control Panel - Security Level

Windows 7
Java 7

Comments   

Warren Chu
+4 # Warren Chu 2013-07-17 19:10
Very helpful information. Fixed my problem. As it happens I set the Java security to Medium and the Java applet automatically prompted me to update to a newer version. After updating I reset the security level back to High and Java applet worked fine.
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nancy
0 # nancy 2014-01-22 23:39
excellent resolution!!!
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Abdul mannan
0 # Abdul mannan 2014-01-23 05:06
application blocked
application blocked by security setting
Your security settings have blocked a self signed application from running
pl.solution give
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David Hume
0 # David Hume 2014-04-21 04:52
Thank you so much for this information. I was trying to alter security settings in totally the wrong place until I consulted my old friend Google and found this post. The error message did not refer to jre but to expired certificates but, since I was trying to upload to a website with Java, I immediately saw your answer was the right one.
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Sue
+5 # Sue 2014-06-06 13:31
I updated java but it still won't load html email. Is there anything else I can try? I've looked for solutions EVERYWHERE!
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Hadley
0 # Hadley 2014-06-16 17:20
Another workaround for that is to add the blocked site to the java exception list.
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Atanu
0 # Atanu 2014-07-17 14:20
Thanks for resolving the problem
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Mike
+1 # Mike 2014-10-22 15:06
Sadly, none of these solved my problem. The site is still blocked.
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mike
0 # mike 2014-11-23 03:44
nope differnt
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greenvomit8
0 # greenvomit8 2014-11-24 07:58
Java Version 8 Update 25 no longer gives you the Option to lower security level to Medium. Now only have option of High or Very High. When I tried connecting to an Avocent DSR1021 via the https://%ipaddr esss% I would get the same message everyone else was experiencing even though I had it set to High and added the https address to the Exception Site List.
Strange thing was that after I added the corresponding http://%ipaddre ss% URL it started working.
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Danny Rath
0 # Danny Rath 2015-02-18 19:49
Absolutley this tip worked perfect for me...
Java 8's only options for Security settings are Very High or High they got rid of Medium. Adding both the HTTP and HTTPS site will do it. Only issue is when remoting into users boxes the url changes everytime. Solid workaround tho
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kkggt
0 # kkggt 2015-02-03 01:18
i did do that but it thus not work ;-;
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